The bobbin does not catch with the needle on the white mighty mender w100

White Westinghouse Mighty Mender WW 100 Instruction Manual

here is a link for a manual for the machine,, the information about putting the bobbin back in the case should be in it
http://sewusa.com/Sewing_Machine_Manuals/White_Manuals/100_Instruction_Manual.htm

yes, the feed dogs are what moves the fabric thru the machine

try sewingpartsonline.com

http://www.hammerwall.com/Download_Manual/70097/
here is the complete instruction book for your sewing machine hope this helps!

Same as with all machines essentially.......
Check the timing of the needle to the hook.
Here is a guide to generic principles of Timing

Well, here's an easy fix. It is either a class 15 or class 66. I would go to a local repair shop with your machine and they can try either of them . They are not real expensive.

I have the "mighty mender" instruction book you are looking for everyone !! Happy to help all you sewers out there!
http://www.hammerwall.com/Download_Manual/70097/

Loading the bobbin for this maching is fairly simple. First thread the machine. Then after placing the bobbin in the machine pull the thread out through the first notch and back through the second. (The end of the thread should be going in the direction of the little channel on the left side of the bobbin area.) Now what I did was make a loop with the end of the thread and pushed it under the casing below the needle. Then if your machine is threaded correctly you should be able to turn the knob on the right side of the machine so the needle goes down and comes back up once. If you've done it right the bobbin thread should come up in the correct spot.